428778757 has 16 divisors (see below), whose sum is σ = 503838720. Its totient is φ = 360687600.

The previous prime is 428778739. The next prime is 428778767. The reversal of 428778757 is 757877824.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428778757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 428778698 and 428778707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428778767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14869 + ... + 32842.

It is an arithmetic number, because the mean of its divisors is an integer number (31489920).

Almost surely, 2^428778757 is an apocalyptic number.

It is an amenable number.

428778757 is a deficient number, since it is larger than the sum of its proper divisors (75059963).

428778757 is a wasteful number, since it uses less digits than its factorization.

428778757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47784.

The product of its digits is 6146560, while the sum is 55.

The square root of 428778757 is about 20706.9736320883. The cubic root of 428778757 is about 754.0689996590.

The spelling of 428778757 in words is "four hundred twenty-eight million, seven hundred seventy-eight thousand, seven hundred fifty-seven".